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STOCK REPURCHASE PROGRAM - Narratives (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Jan. 27, 2022 | Sep. 30, 2021 | Nov. 08, 2017
Shareholders Equity [Line Items] |  |  |  |  |  |
Common stock, authorized (in shares) | 224,400,000 | 224,400,000 |  |  |  |
Common stock, par or stated value (in usd per share) | $ 0.01 | $ 0.01 |  |  |  |
Preferred stock, shares authorized | 149,600,000 |  |  |  |  |
Preferred stock, par value | $ 0.01 |  |  |  |  |
Common stock, issued (in shares) | 61,904,833 | 60,995,513 |  |  |  |
Treasury stock, common (in shares) | 5,688,639 | 5,688,639 |  |  |  |
Preferred stock, shares outstanding | 0 | 0 |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 2,200 |  | $ 650
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 612.13 |  |  |
Payments for Repurchase of Common Stock | $ 0 | $ 0 | $ 912 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 1,288 |  |  |  |  |
Treasury Stock |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Treasury stock, common (in shares) | 5,688,639 | 5,688,639 | 5,688,639 |  | 4,198,226 |
Shares repurchased under the program |  |  | 1,490,413 |  |  |

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